I share the conviction held by many others that the movement of thought called "symbolism" is of great significance. Not only does this movement cut across the traditional lines of division among philosophers, but it coordinates in a remarkable way the work of linguists, sociologists, psychologists, anthropologists, and biologists, in so far as their work connects with the topic of mind. In the degree that the symbolic movement is significant, a work which develops systematically the basis of the movement, and at the same time applies this analysis to the topic of mind and to certain basic philosophical problems, can at least claim to be an important contribution to critical thought. Whether the claim is substantiated depends, of course, on the quality of the work itself.